[HeloCrewChief]

If you get the whole truck just make sure the blood has not soaked through the carpet on to any metal components. Blood is highly corrosive. Don't see any issues with putting on some gloves and going to town. Just make sure you pull everything out including the carpet and give it a good scrub. If it makes you feel better people live and die in medevac Helicopters everyday and they fly around just fine with no haunting. Also, if you plan on reselling the engine/trans it is beneficial to have the truck it came out of around as I find people want proof of the mileage and the story your telling them.